Steam-engine



No. 62`5,|95. Patented May I6, |899. W. PEPPERLING.

STEAM ENGINE'.`

(Application led Dec: 22, 189B.)

(No Model.)

` ferr-ed manner of carrying out the invention CNTTED STATES E PATENT Gratos.

WILLAM PEPPERLING, OF4 AITKIN, MINNESOTA.

STEAM-ENGINE.

SPECIFICATION forming part of Letters Patent No. 625,195, datediMay 16, 1899.

Application filed December 22, 1898. Serial No. 700,069. (No model.)

To all whom zit may concern.-

Be it known that I, WILLIAM PEPPERLING, a citizen of the United States, and a resident of Aitkin, Aitkin county, State of Minnesota, have invented certain new and useful Improvements in Steam-Engines; and my preis set forth in the following full, clear, and exact description, terminating with claims particularly specifying the novelty.

This invention relates to compound steamengines, more especially of that type embodying a multiple cylinder; and the object of the same is to produce an engine wherein the exhaust from one cylinderis used fordriving the piston in another.

To this end the invention consists in the construction of cylinders, pistons, and ports illustrated in the accompanying drawing, showing a section ot my improvement, and as fully described and claimed below.

Referring to the drawing by letters and figures, C designates as a whole the cylinder, here shown as in three'members end to end and specifically designated by supernumerals 1, 2, and 3, and P similarly indicates the pis-` tons in these cylinders, all mounted on the piston-rod R, moving through suitable stuft-A in g-boxes where shown.

S is the steam-chest, V the valve therein, and E the rod leading from such valve to a suitable eccentric or other valve-operating mechanism. (Not shown.)

Thus far and also including the common steam-inlet I and exhaust X no novelty is claimed for the construction shown.

Coming now more particularly to my present invention, the live steam is admitted at, say, one hundred and fifty pounds pressure through 1 to the port 2,leading to the right end of the cylinder CB and entering at 8 behind the piston P3, which is about to move in the direction of the arrow. The exhaust from the other end of this cylinder leaves it at 4, passes along port 5 through a Y 6,- up through opening 7 in the valve V, and along the outlet 8 to main exhaust X. Hence on this stroke the right-hand cylinder receives steam direct and exhausts direct. The rod R causes a simultaneous movement of the left-hand piston P. Here the moment the valve V moves to the position illustrated the steam, which has just been used on the preceding stroke and is now down to, say, forty pounds pressure,

passes out at llalong port 12 through opencylinder C2 is taken from the outlet of the left- 4 hand cylinder C. Steam flowing through port 12 and Y 14 branches at the latter point and some of it passes along port 21 to the point 22 behind piston P, thus further increasing the volume and reducing the pressure in all these parts to, say, thirty-eight. Meanwhile the exhaust from in front of this piston Vleaves the cylinder C2 'at 23, passes alongport 24, and joins the main exhaust at Y 6; The thirty-eight pounds at the right of pistonP2 will now moveit to the left with a force which, through rod R, is added to that set upby the piston P3, and as the pressure on opposite sides of piston P continues equal, by` reason of the port connecting those sides, this piston now does no'work. As the intermediate piston P2 moves to the left the steam area increases and necessarily the pressure falls from Athirty-eight to, say, nothing at the compleis taken equally from both sides thereof by means of the connectingports described. Thus it will be seen that'at the beginning of this stroke the left-hand piston is equalized as to pressure; but the steam exhausted therefrom is given an opportunity to work on expansion in the intermediate cylinder, and it will be evident that on the reverse movement (which of course takes place through proper shifting of the valve V) the reverse operation will ensue. Hence all steam is used twice in this arrangementthe first time at boilerpressure in one of the extreme cylinders, expanded and equalized in the other, and under expansion in the intermediate cylinder,

and the second time on the reverse stroke,`

when the live steam just used now expands and equalizes itself in the one extreme cylinder and expands in the intermediate cylinder, while the other extreme cylinder is acta ing under a fresh charge of live steam. It

IOO

will be unnecessary to amplify the advantages resulting from this arrangement, because the expansive power of steam is so well understood. My object is to give full play to this power and use it to the fullest advantage with the simplest construction of parts.

What is claimed as new isl. In a compound engine, the combination with three pistons of equal diameter moving in unison in three cylinders arranged in tandem, a steam-chest, a valve therein having two openings, -a main exhaust with which said openings register alternately, and two ports on either side of such exhaust; of ports leading from the outer ends of the extreme cylinders to the endmost ports in the steamchest, and other ports leading from the next innermost ports in the steamchest,each to the inner end of one extreme cylinder and through a branch to the remote end of the intermediate cylinder, all as and for the purpose set forth.

2. In a compound engine, the combination with three cylinders of equal diameter end to end and in tandem, a common rod, and three pistons thereon in their respective cylinders; of main ports leading from the outer ends of the extreme cylinders, other ports leading from their inner ends to points adjacent a common exhaust, branch ports leading from said latter ports across each other to respectively WILLIAM PEPPERLING.

Witnesses:

GEO. T. WILLIAMS, R. N. BOND. 

